Well, based on instances shown so far, CoC is a must for King of Hell to be named on an attack.
Take a look at this page. The first two instances have a lot more Ryo flow than Lucci's case and neither of them are KOH.
The panel on the bottom is KOH. The first two panels are just new standard to Enma's satisfaction.
There was even more Ryo release during Hiryu Kaen and it wasnt named as King of Hell because it lacked CoC.
Oden who had both wasnt able to pull King of Hell either. So even with CoC and CoA it is still not KoH, this is unique to Zoro.
I am willing to support your take as soon as we get an instance of King of Hell named attack without aCoC being present.
I understand your Point, but according to you, CoA by itself regardless if Normal or Overflowing (Green Smoke) doesn't necessitate a Name Change, and also if Zoro uses average CoC Coating without CoA, it won't necessitate a Name Change
Average CoA Alone (No Smoke) = No Name Change
Max CoA Alone = No Name Change
Average CoC Alone = No Name Change
If Max CoA Alone & Average CoC Alone don't require a Name Change, why would Fusing them does
Followed by Zoro Modifying the Name again when using Max CoC
It's more Simple & Logical to just say that Average Usage of CoA/CoA doesn't justify Name Change
But Max Usage of either does
If let's say They are distributed Equally, meaning Max CoA is 50% of Zoro's Haki Potential (No Asura) & Max CoC is 50%
While Average Usage is 25%, then We get this:
100% Zoro = Max CoC + Max CoA
75% Zoro = Max CoC + Average CoA or Average CoC + Max CoA
50% Zoro = Both Average or Max CoC + No CoA or No CoC + Max CoA
So against Lucci, even if We consider Max CoA = Max CoC, Zoro was Fighting with 50%
But We both know that's not the Case, and seeing how He is Fighting right now, which is even Less
It's safe to say that Zoro is only Using 1/3 of his Max Power (No Asura) against Lucci